Which vehicles must stop at all railroad crossings?

Trucks transporting hazardous materials.
School buses.
Transit buses with passengers on board.
All of the above.
Explanation

Certain vehicles must make full stops at all railroad crossings - including hazardous material carriers, passenger-carrying transit buses, and school buses (whether empty or transporting students). When following these vehicles, always be prepared to stop. For maximum safety: Never pass stopped vehicles on two-lane roads. On multi-lane roads, only consider passing with extreme caution when the crossing has active warning signals (lights/gates) clearly indicating no approaching train, and only if you have a completely unobstructed view of the tracks.

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